| 1 |
Class 1A: Historic (pre 1968) up to 1600cc excluding twin cam engined cars |
| 2 |
Class 1B: Historic (pre 1968) 1601cc to 2000cc including twin cam engines, excluding Porsche 911/912 |
| 3 |
Class 1C: Historic (pre 1968) 2001cc and over including Porsche 911/912 |
| 4 |
Class 2A: Post Historic (1968 - 1974) up to 1600cc excluding twin cam engined cars |
| 5 |
Class 2B: Post Historic (1968 - 1974) 1601cc to 2000cc including twin cam engines, excluding Porsche 911/912 |
| 6 |
Class 2C: Post Historic (1968 - 1974) 2001cc and over including Porsche 911/912 |
| 7 |
Class 3A: Classic (1975 - 1981) up to 1600cc excluding twin cam engined cars |
| 8 |
Class 3B: Classic (1975 - 1981) 1601cc to 2000cc including twin cam engines, excluding Porsche 911/912 |
| 9 |
Class 3C: Classic (1975 - 1981) 2001cc and over including Porsche 911/912 |
| 10 |
Class MA: Modified (pre 1982) up to 1600cc |
| 11 |
Class MB: Modified (pre 1982) 1601cc to 2000cc with no more than 2 valves per cylinder |
| 12 |
Class MB: Modified (pre 1982) 1601cc to 2000cc with more than 2 valves per cylinder |
| 13 |
Class MC: Modified (pre 1982) 2001cc and over |